Which of the following lenses would you prefer

Asked by admin @ in Science viewed by 244 People

Which of the following lenses would you prefer to use while reading the small letters found in dictionary.and why?

a. A convex lens of focal length 30 cm.
b. A concave lens of focal length 30 cm.
c. A concave lens of focal length 5 cm.
d. A convex lens of focal length 5 cm.

Answered by admin @


A convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length. Also, magnification is more for convex lenses having shorter focal length. Therefore, for reading small letters, a convex lens of focal length 5 cm should be used.

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